Waste energy control and management in power amplifiers
First Claim
1. An amplifying apparatus for linearly amplifying input signals to desired power levels, comprising:
- Butler matrix means for combining a first plurality of input signals and producing a first plurality of output signals which are combinations of input signals, wherein said input signals are inputted into said Butler matrix through input ports which are selected so as to provide optimum spacing for said input signals;
a second plurality of coupled, non-linear power amplifier stages for amplifying said combinations of the input signals, wherein the second plurality is larger than the first plurality; and
second Butler matrix means for combining said amplified combinations of the input signals;
said second Butler matrix means outputting a first plurality of wanted output signals and a third plurality of unwanted signals, wherein the third plurality is the difference between the second plurality and the first plurality.
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Abstract
An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers is disclosed. The amplifying apparatus comprises a limiter for separating amplitude variations from the desired signal and producing a constant amplitude signal bearing the phase of the desired signal and an amplitude related signal. In addition, a drive signal generater produces two drive signals each dependent on the constant amplitude signal and the amplitude related signal such that each drive signal depends on the phase of the desired signal and such that the sum of the squares of the amplitudes of the drive signals is constant. Finally, a coupler couples the two drive signals to produce two constant amplitude signals for driving the pair of non-linear power amplifiers and for coupling the outputs of the power amplifiers to produce two amplified output signals, one of which is the linearly amplified desired signal and the other of which is a waste energy signal.
120 Citations
3 Claims
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1. An amplifying apparatus for linearly amplifying input signals to desired power levels, comprising:
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Butler matrix means for combining a first plurality of input signals and producing a first plurality of output signals which are combinations of input signals, wherein said input signals are inputted into said Butler matrix through input ports which are selected so as to provide optimum spacing for said input signals; a second plurality of coupled, non-linear power amplifier stages for amplifying said combinations of the input signals, wherein the second plurality is larger than the first plurality; and second Butler matrix means for combining said amplified combinations of the input signals;
said second Butler matrix means outputting a first plurality of wanted output signals and a third plurality of unwanted signals, wherein the third plurality is the difference between the second plurality and the first plurality. - View Dependent Claims (2, 3)
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Specification
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- Resources
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Current AssigneeEricsson, Inc. (Telefonaktiebolaget LM Ericsson)
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Original AssigneeEricsson, Inc. (Telefonaktiebolaget LM Ericsson)
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InventorsLampe, Ross W., Dent, Paul W.
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Primary Examiner(s)Mullins, James B.
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Application NumberUS08/475,659Time in Patent Office713 DaysField of Search330/124 R, 330/149, 330/295, 342/373US Class Current330/124.00RCPC Class CodesH03F 1/0294 using vector summing of two...H03F 1/3229 using a loop for error extr...H03F 1/3252 using multiple parallel pat...H03F 1/34 Negative-feedback-circuit a...H03F 3/24 of transmitter output stagesH03F 3/602 Combinations of several amp...H04B 1/04 CircuitsH04B 1/0483 Transmitters with multiple ...H04B 1/1607 Supply circuits converters ...H04B 1/52 Hybrid arrangements, i.e. a...H04B 2001/0433 with linearisation using fe...
